Phase-shifted full-bridge controller with enhanced control logic, 0°C to 70°C آیسی PWM اریجینال فول بردیج
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استفاده در انواع صنایع از جمله بردهای درایو دستگاه های جوش و برش و اینورتری
مخابراتی
مدارات عمومی
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Features
1• Programmable-output turnon delay
• Adaptive delay set
• Bidirectional oscillator synchronization
• Voltage-mode, peak current-mode, or average
current-mode control
• Programmable soft start, soft stop, and chip
disable via a single pin
• 0% to 100% duty-cycle control
• 7-MHz error amplifier
• Operation to 1 MHz
• Typical 5-mA operating current at 500 kHz
• Very low 150-μA current during UVLO
Applications
• Phase-shifted full-bridge converters
• Off-line, telecom, datacom, and servers
• Distributed power architecture
• High-density power modules
The UCC3895 is a phase-shift PWM controller that implements control of a full-bridgepower stage by phase shifting the switching of one half-bridge with respect to the other. Thedevice allows constant frequency pulse-width modulation in conjunction with resonant zero-voltageswitching to provide high efficiency at high frequencies. The part is used either as a voltage-modeor current-mode controller.
While the UCC3895 maintains the functionality of the UC3875/6/7/8 family and UC3879, itimproves on that controller family with additional features such as enhanced control logic,adaptive delay set, and shutdown capability. Because the device is built using the BCDMOS process,it operates with dramatically less supply current than it’s bipolar counterparts. The UCC3895operates with a maximum clock frequency of 1 MHz.
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